High-temperature tensile rate setting method

A technology of stretching rate and setting method, which is applied in the field of mechanical testing, can solve the problems of cumbersome testing, etc., and achieve the effect of setting scientifically and reasonably, ensuring correctness and reliability, and the method is simple and feasible

Active Publication Date: 2016-02-03
ANGANG STEEL CO LTD
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AI Technical Summary

Problems solved by technology

Therefore, this method is cumbersome to test and has certain limitations.

Method used

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Experimental program
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Effect test

Embodiment Construction

[0020] 1. Process the sample into a high-temperature tensile sample suitable for the tensile test system, such as threaded sample, pin shaft sample, directly clamped round sample or plate sample.

[0021] 2. Using crossbeam displacement control, according to GB / T4338-2006, set the stretching rate of the four stages of linear elastic section, elastic-plastic section, yield section and post-yield section as 0.005 / min, 0.005 / min, 0.005 / min, Stretch at 0.15 / min, and draw a force-extension curve, and find out on the curve from the beginning of the test to the elastic limit R P0.01 time t 1 and the time t until the end of the yielding phase 2 .

[0022] 3. The best test time is 3min or 180s, if t 1 for 315s, t 2 is 450s, then the test time of this test is 450÷180=2.5 ​​times of the optimal time, t 1 :t 2 =315:450=7:10, so the displacement rate of the beam in the linear elastic section of the next sample is set to 0.005×2.5×2÷10×7=0.0175 / min, and the displacement rate of the b...

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PUM

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Abstract

The invention discloses a high-temperature tensile rate setting method. According to the invention, the tensile rates of a linear elastic section, an elastic-plastic section, a yield section, and a yield rear section are sequentially set to be 0.005 / min, 0.005 / min, 0.005 / min and 0.15 / min by adopting cross beam displacement control for stretching, a force-extension graph is drawn, the time t1 from starting of a test to elastic limit and the time t2 from starting of the test to the end of the yield section are found out, t2 / 3min is set to be n, t1:t2 is set to be n1:n2, then the cross beam displacement rate of the linear elastic section of a next sample is set to be 0.005*n*2 / n2*n1 and the cross beam displacement rates of the elastic-plastic section and the yield section are set to be 0.005*n*2 / n2*(n2-n1). Stretching is carried out according to the set tensile rate, t1 and t2 are found out on the graph, and if t2 is equal to 2-4min and t1 is equal to 1-3min, the setting of the test rate is complete; if not, correction is carried out. With the adoption of the method disclosed by the invention, a uniform sample deformation rate can be set for different tensile test systems, so that data tested by different testing machines has comparability, therefore, high accuracy and reliability of high-temperature test data can be guaranteed.

Description

technical field [0001] The invention belongs to the field of mechanical detection, in particular to a method for setting a high-temperature tensile rate, in particular to a method for setting a tensile rate in a high-temperature tensile test using crossbeam displacement control. Background technique [0002] High temperature tensile test is an important test method to effectively evaluate the static bearing capacity of metal materials under short-term tensile load. There are many factors that affect the results of high-temperature tensile tests. In addition to the factors of the material itself, there are also factors such as test speed, clamping method, sampling frequency, temperature, and sample processing shape. Among them, the test speed is an important factor affecting high-temperature tensile performance indicators. factor. [0003] The tensile test includes linear elastic deformation stage, elastoplastic deformation stage, yield stage, work hardening stage, and necki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/02
Inventor 苏洪英吕丹孙绍广王超逸
Owner ANGANG STEEL CO LTD
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